{"instruction": "You are an expert in relationship extraction. Please extract relationship triples that match the schema definition from the input. Return an empty list for relationships that do not exist. Please respond in the format of a JSON string.", "schema": ["employee of", "city of headquarters", "state or provinces of residence"], "input": "Prior to receiving his PhD Gregorian had already begun teaching European and Middle Eastern history at San Francisco State College ( now  San Francisco State University  ) upon returning to  California  from Afghanistan in 1962 ."}
{"employee of": [], "city of headquarters": [], "state or provinces of residence": []}